Bright End of the UV Luminosity Functions at z=4-7 Derived with the 200 deg^2 Data of the Subaru HSC Survey

Yoshiaki Ono

We investigate the UV luminosity functions (LFs) of z=4-7 dropout galaxies based on the Subaru strategic program survey with HSC. The effective survey area is about 200 deg^2, which is more than 50 times larger than previous studies of high-z luminous galaxies. This large survey area allows us to cover an unprecedentedly large cosmic volume at z>4 and to identify 3083 very rare luminous sources with Muv < -23 mag. Combining our UV LFs with those from the latest ultra-deep HST legacy surveys, we obtain the UV LFs at z=4-7 that span a very wide UV luminosity range of ~0.002 - 20 L*. We find a clear overabundance of dropouts at the bright end over the best-fit Schechter function. Our precision UV LFs in the wide luminosity range distinguish three UV LF components very clearly for the first time, a galaxy Schechter function, a power-law lensing magnification bias, and a faint-end AGN UV LF.